i had exactly the same specs of computer as you have except that mine was only 1.2mhz celeron... your video card is the problem.. i had to update my own video card to gforce 2 just to get it to work.. although.. someone did told me that you need a certain kind of patch to make it work ...
try looking at this post..
http://www.ironworksforum.com/ubb/cg...=000201#000000
because i also had this kind of problem [img]smile.gif[/img]